Honeywell TH5110D Thermostat User Manual

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TH5110D Non-programmable  
Thermostat  
INSTALLATION INSTRUCTIONS  
APPLICATION  
cooling systems or 750 mV heating systems. See Table 1  
The TH5110D Non-programmable Thermostat provides  
for a description.  
electronic control of 24 Vac, single-stage heating and  
Table 1. TH5110D Thermostat description.  
Description  
Feature  
Powering Methods  
Battery only  
Common wire only  
Common wire with battery backup  
System Types (Up to 1 Heat, 1 Cool)  
Gas, oil or electric heat with air conditioning  
Warm air, hot water, high efficiency furnaces, heat pumps, steam  
and gravity  
Heat only— includes power to open and power to close zone valves  
(
Series 20) and normally-open zone valves  
Heat only with fan  
Cool only  
750 mV heating systems  
Changeover  
System Setting  
Fan Setting  
Manual or auto changeover selectable  
Heat-Off-Cool-Auto  
Auto-On  
MERCURY NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
Contact your local waste management authority  
for instructions regarding recycling and the  
proper disposal of the old thermostat.  
®
U.S. Registered Trademark  
Copyright © 2004 Honeywell International Inc. •  
• All Rights Reserved  
6
9-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
INSTALLATION  
When installing this product…  
Separate Wallplate from Thermostat  
1
.
.
Read these instructions carefully. Failure to follow  
these instructions can damage the product or  
cause a hazardous condition.  
1. Separate the wallplate from the thermostat. See  
Fig. 2.  
2
Check the ratings given in the instructions and on  
the product to make sure the product is suitable for  
your application.  
THERMOSTAT  
WALLPLATE  
WIRE HOLE  
3.  
.
Installer must be a trained, experienced service  
technician.  
4
After completing installation, use these instructions  
to check out the product operation.  
CAUTION  
Electrical Hazard.  
Can cause electrical shock or equipment  
damage.  
Disconnect power before beginning installation.  
M22042  
Select Thermostat Location  
Fig. 2. Separate wallplate from thermostat.  
Select a location for the thermostat about 5ft (1.5m)  
above the floor in an area with good air circulation at  
average temperature. See Fig. 1.  
Install Wallplate (See Fig. 3.)  
Mount the thermostat horizontally on the wall:  
1
.
Pull the wires through the wire hole on the  
wallplate.  
2.  
Position the wallplate on the wall with the arrow  
pointing up. Level the wallplate for appearance  
only.  
3.  
Use a pencil to mark the mounting holes.  
NO  
YES  
4. Remove the wallplate from the wall and drill  
two 3/16-in. holes in the wall (if drywall) as marked.  
For firmer material such as plaster, drill two 7/32-in.  
holes. Tap the wall anchors (provided) into the  
drilled holes until flush with the wall.  
NO  
NO  
5 FEET  
[
1.5 METERS]  
5.  
Pull the wires through the wire hole on the  
wallplate and position the wallplate over the wall  
anchors.  
6.  
Insert the mounting screws into the wall anchors  
and tighten.  
M22085  
DRILLED HOLES (2)  
WALL  
ANCHORS (2)  
Fig. 1. Select thermostat location.  
Do not install the thermostat where it can be affected by:  
Drafts or dead spots behind doors and in corners.  
Hot or cold air from ducts.  
Rc  
R
Y
C
Radiant heat from sun or appliances.  
Concealed pipes and chimneys.  
(O/B)  
W
G
WALLPLATE  
Unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
MOUNTING  
SCREWS (2)  
M22140  
Fig. 3. Install wallplate.  
69-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
WIRING  
All wiring must comply with local electrical codes and  
ordinances. Refer to Table 2 for descriptions of terminal  
designations. See Fig. 6-13 for wiring diagrams for  
specific equipment applications.  
2. Push excess wire back into the wall opening and  
restrict wires to the shaded area. See Fig. 5.  
WALLPLATE  
WALL OPENING  
CAUTION  
Electrical Hazard.  
Can cause electrical shock or equipment  
damage.  
Rc  
R
Disconnect power before wiring.  
Y
C
(
O/B)  
W
G
IMPORTANT  
Use 18-22 gauge thermostat wire. Shielded  
cable is not required.  
1.  
Loosen the screw terminals that are used for the  
application. Insert the wires into the terminal block  
and tighten each screw terminal. See Fig. 4.  
WIRE  
SHADED AREA  
M22142  
WIRES  
Fig. 5. Restrict wires to shaded area of wire hole.  
WALLPLATE  
TERMINAL BLOCK  
RC  
R
Y
3.  
Plug the wall opening with nonflammable insulation  
to prevent drafts from affecting the thermostat.  
SCREW TERMINALS  
W/O/B  
G
LETTER  
DESIGNATIONS  
RC  
R
Y
C
O/B W  
G
M22141  
Fig. 4. Insert wires into terminal block.  
Table 2. Terminal designation descriptions.  
Terminal  
Designation  
Description  
Power for cooling—connect to secondary side of cooling system transformer  
Power for heating—connect to secondary side of heating system transformer  
Compressor contactor  
Rc (see Note 1)  
R (see Note 1)  
Y
C (see Note 2)  
O/B W (see Note 3)  
G
Common wire from secondary side of cooling system transformer  
Heat relay or changeover valve terminal for heat pumps  
Fan relay  
NOTES:  
1
.
When used in a single-transformer system, leave metal jumper in place between Rc and R. If used on a  
two-transformer system, remove metal jumper between Rc and R.  
2.  
.
Common wire is optional when thermostat is used with batteries.  
3
If thermostat is configured for a heat pump in the Installer Setup, configure changeover valve  
for cool (O-factory setting) or heat (B).  
3
69-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
WIRING DIAGRAMS  
THERMOSTAT WIRING TERMINALS  
THERMOSTAT WIRING TERMINALS  
Rc  
Rc  
R
R
2
3
2
Y
Y
C
O/B W  
G
C
3
O/B W  
G
4
CHANGEOVER  
VALVE  
HEAT  
RELAY  
FAN  
RELAY  
COMPRESSOR  
CONTACTOR  
FAN  
RELAY  
COMPRESSOR  
CONTACTOR  
R
C
L1  
R
C
L1  
(
HOT)  
(
HOT)  
L2  
L2  
1
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
2
3
4
FACTORY INSTALLED JUMPER.  
2
3
FACTORY INSTALLED JUMPER.  
OPTIONAL 24 VAC COMMON CONNECTION.  
OPTIONAL 24 VAC COMMON CONNECTION.  
M22068  
CONFIGURE SYSTEM TYPE TO HEAT PUMP AND CHANGEOVER  
VALVE TO EITHER O OR B IN THE INSTALLER SETUP.  
M22070  
Fig. 6. Typical hookup of conventional 1H/1C system  
with one transformer.  
Fig. 8. Typical hookup of 1H/1C heat pump.  
THERMOSTAT WIRING TERMINALS  
THERMOSTAT WIRING TERMINALS  
Rc  
2
R
Y
2
RC  
C
L1  
Rc  
R
(
HOT)  
C
L2  
3
Y
1
O/B W  
G
C
O/B W  
G
3
COMPRESSOR  
CONTACTOR  
HEAT  
RELAY  
FAN  
RELAY  
R
C
L1  
HOT)  
L2  
(
HEAT  
RELAY  
R
C
L1  
(HOT)  
1
L2  
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
2
3
FACTORY INSTALLED JUMPER.  
OPTIONAL 24 VAC COMMON CONNECTION.  
M22071  
2
3
REMOVE FACTORY INSTALLED JUMPER.  
OPTIONAL 24 VAC COMMON CONNECTION.  
M22069  
Fig. 9. Typical hookup of heat only system.  
Fig. 7. Typical hookup of conventional 1H/1C system  
with two transformers.  
69-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
THERMOSTAT WIRING TERMINALS  
2
THERMOSTAT WIRING TERMINALS  
2
Rc  
R
Y
Rc  
R
C
3
Y
O/B W  
G
C
O/B W  
G
3
COMPRESSOR  
CONTACTOR  
HEAT  
RELAY  
FAN  
RELAY  
R
C
L1  
FAN  
RELAY  
(HOT)  
R
L1  
L2  
1
(
HOT)  
C
L2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
2
3
FACTORY INSTALLED JUMPER.  
2
3
FACTORY INSTALLED JUMPER.  
OPTIONAL 24 VAC COMMON CONNECTION.  
M22074  
OPTIONAL 24 VAC COMMON CONNECTION.  
M22072  
Fig. 12. Typical hookup of cool only system.  
Fig. 10. Typical hookup of heat only system with fan.  
THERMOSTAT WIRING TERMINALS  
THERMOSTAT WIRING TERMINALS  
Rc  
2
Rc  
R
R
Y
2
Y
4
C
4
C
3
3
O/B W  
G
O/B W  
G
B
W
R
POWER TO OPEN  
AND POWER TO  
CLOSE  
NORMALLY  
OPEN  
ZONE VALVE  
TR TR  
MOTOR OR VALVE  
1
R
C
L1  
(HOT)  
(
SERIES 20)  
R
C
L1  
(
HOT)  
L2  
1
L2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
2
3
4
FACTORY INSTALLED JUMPER.  
2
3
4
FACTORY INSTALLED JUMPER.  
OPTIONAL 24 VAC COMMON CONNECTION.  
OPTIONAL 24 VAC COMMON CONNECTION.  
CONFIGURE SYSTEM TYPE TO HEAT ONLY IN THE INSTALLER SETUP.  
M22075  
CONFIGURE SYSTEM TYPE TO HEAT ONLY IN THE INSTALLER SETUP.  
M22073  
Fig. 11. Typical hookup of heat only Series 20  
system.  
Fig. 13. Typical hookup of a heat only system with a  
normally open zone valve.  
5
69-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
POWER THE THERMOSTAT  
You can choose from three methods to power the  
Mount Thermostat to Wallplate  
thermostat:  
1.  
Align the four tabs on the wallplate with the four  
slots on the back of the thermostat. Push the  
thermostat straight onto the wallplate until it snaps  
into place. See Fig 15.  
Batteries only (AAA alkaline).  
24 Vac common wire only.  
24 Vac common wire with battery backup (AAA  
alkaline).  
NOTE: Battery backup prevents blank displays during  
power interruptions.  
WALLPLATE  
TABS  
Wiring 24 Vac Common  
Single-Transformer System—Connect the common  
side of the transformer to the C screw terminal of the  
thermostat wallplate. Leave the metal jumper in place  
between Rc and R.  
Rc  
R
SLOTS ON  
BACK OF  
THERMOSTAT  
Y
C
(
O/B)  
W
G
Two-Transformer System—Connect the common side  
of the cooling transformer to the C screw terminal of  
the thermostat wallplate. Remove the metal jumper  
between Rc and R.  
TABS  
Installing Batteries  
Install two AAA alkaline batteries on the back of the  
thermostat as marked on the battery holder. See Fig. 14.  
NOTE: After the thermostat is mounted on the  
wallplate, the thermostat does not require  
removal from the wallplate to replace the  
batteries. Refer to the enclosed Operating  
Instructions, 69-1713, for more information on  
the removable battery holder.  
M22078  
Fig. 15. Mount thermostat to wallplate.  
BACK OF THERMOSTAT  
BATTERY HOLDER  
M22056  
BATTERIES  
Fig. 14. Installing batteries.  
69-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
INSTALLER SETUP  
Configure Installer Setup  
1.  
Enter Installer Setup by pressing and holding the  
Up and Fan buttons, at the same time, for  
approximately five seconds, until the screen  
changes. See Fig. 16.  
Replace Batt  
Service Needed  
Done  
Next  
Inside Replace Batt  
Service Needed  
Cool  
Setting  
Fan  
System  
Auto  
Cool  
M22143  
Fig. 17. Configure Installer Setup.  
3.  
See Fig. 18 to review how the thermostat buttons  
are used during Installer Setup. See Table 3 for the  
Installer Setup Numbers and Settings.  
M22079  
Fig. 16. Enter Installer setup.  
2.  
Release the Up and Fan buttons when the  
display on the thermostat matches the display  
in Fig. 17.  
I
N
NU  
ST  
A
ER  
LLE  
R
SET  
UP  
SETTING  
MB  
U
P
BUTTO  
N
Replace Batt  
Service Needed  
CHANGES SETTING  
D
OWN BUTTON  
Done  
Next  
CHANGES SETTING  
D
ONE  
BUTTO  
N
N
EXT BUTTO  
N
EXITS THE  
INSTALLER SETUP  
AND SAVES YOUR SETTINGS  
ADVANCES TO NEXT  
INSTALLER SETUP  
NUMBER  
M22144  
Fig. 18. Review thermostat buttons used for Installer  
Setup.  
7
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
Installer Setup Numbers and Settings  
Table 3. Installer setup numbers and settings.  
Installer Setup  
Number  
Installer Setup Name  
Settings  
1
System Type  
0—gas, oil or electric heat with air conditioning (Factory Setting)  
1
2
Heat pump  
Heat only (two-wire systems or power to open and power to  
close zone valves or normally-open zone valves)  
3
4
Heat only with fan  
Cool only  
2
Changeover Valve-O/B  
Terminal Energized in  
Heating or Cooling  
0—Changeover valveO/B terminal energized in cooling  
May not appear.  
See Note a  
(Factory Setting)  
(
Heat Pumps only)  
1—Changeover valveO/B terminal energized in heating  
3
Fan Control in Heating  
0— Gas or oil furnaceequipment controls fan in heating  
May not appear.  
See Note b  
(Factory Setting)  
1
Electric furnacethermostat controls fan in heating  
5
Heating Cycle Rate in  
cycles per hour (cph)  
5—5 cph used for gas or oil furnaces (less than 90% efficient)  
May not appear.  
See Note c  
(Factory Setting)  
1
3
9
2
1 cph used for steam and gravity  
3 cph used for hot water and high efficiency furnaces (90%+)  
9 cph used for electric furnaces  
, 4, 6, 7, 8, 10, 11, 12—Other cycle rate settings  
9
Compressor Cycle Rate  
in cycles per hour (cph)  
3—3 cph recommended for compressors (Factory Setting)  
1, 2, 4, 5, 6—Other cycle rate settings  
May not appear.  
See Note d  
1
2
System Setting  
Adjustment  
0—Manual changeover (Factory Setting) (Heat, Off, Cool)  
1—Auto changeover (Heat, Off, Cool, Auto)  
May not appear.  
See Note e  
2
Auto changeover only (Auto)  
0—Fahrenheit temperature display (Factory Setting)  
Celsius temperature display  
1
1
4
5
Temperature Display  
1
Compressor  
5—Five-minute compressor off-time setting (Factory Setting)  
0, 1, 2, 3, 4—Other compressor off-time settings  
May not appear.  
See Note f  
Protection—  
Minimum-Off Timer in  
minutes  
Press the Next button to go to the beginning of the Installer Setup or press the Done button to exit the  
Installer Setup and save your settings.  
Installer Setup Notes:  
a—Installer Setup Number 2 does not appear if Installer Setup Number 1 is set to 0, 2, 3 or 4.  
b—Installer Setup Number 3 does not appear if Installer Setup Number 1 is set to 1, 2 or 4.  
c—Installer Setup Number 5 does not appear if Installer Setup Number 1 is set to 1 or 4.  
d—Installer Setup Number 9 does not appear if Installer Setup Number 1 is set to 2 or 3.  
e—Installer Setup Number 12 does not appear if Installer Setup Number 1 is set to 2, 3 or 4.  
f— Installer Setup Number 15 does not appear if Installer Setup Number 1 is set to 2 or 3.  
69-1712—1  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
INSTALLER SYSTEM TEST  
Use the Installer System Test to test the heating, cooling  
and fan.  
SYSTE  
TEST  
NU  
M
SYSTE  
ST  
NUMBER  
M
UP BUTTON  
TURNS THE  
SYSTEM ON  
A
T
U
S
M
B
ER  
CAUTION  
Equipment Damage Hazard.  
Minimum compressor off time is bypassed  
during Installer System Test  
Avoid cycling compressor quickly.  
Replace Batt  
Service Needed  
Done  
Next  
How to Use the Installer System Test  
1.  
Enter the Installer System Test by pressing and  
holding down the Up and Down buttons at the  
same time for approximately five seconds, until the  
screen changes. See Fig. 19.  
D
O
N
E
BUTTO  
N
DOWN BUTTON  
TURNS THE  
SYSTEM OFF  
EXITS THE INSTALLER  
SYSTEM TEST  
N
EXT BUTTO  
ADVANCES TO NEXT  
SYSTEM TEST NUMBER  
N
M22146  
Replace Batt  
Fig. 20. Review thermostat buttons used during  
Installer System Test.  
Service Needed  
Fan  
System  
Auto  
Cool  
Installer System Tests  
IMPORTANT  
Use the Installer System Test to test the  
heating, cooling and fan. The setting you  
choose for System Type (Installer Setup  
Number 1) may prevent some System Test  
Numbers from appearing.  
M22145  
Fig. 19. Enter Installer System Test.  
2.  
See Fig. 20 to review how the thermostat buttons  
are used during the Installer System Test. See  
Table 4 for available Installer System Tests.  
Table 4. Installer System Tests.  
System Test Number  
Test Type  
System Status Number and Description  
10  
Heating System Test  
1—Heat turns on. When Installer Setup Number  
1
is set to 1 or Installer Setup Number 3 is set to  
, the fan turns on immediately.  
1
0
—Heat and fan turns off.  
30  
40  
70  
Cooling System Test  
Fan System Test  
1—Compressor and fan turns on.  
—Compressor and fan turns off.  
1—Fan turns on.  
—Fan turns off.  
0
0
Thermostat Information  
71—Software revision number (Major)  
72—Software revision number (Minor)  
(
For reference only)  
73—Configuration identification code (Major)  
74—Configuration identification code (Minor)  
75—Production configuration date code (Week)  
76—Production configuration date code (Year)  
Press the Next button to go to the beginning of the Installer System Test or press the Done button to exit the  
Installer System Test.  
9
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
THERMOSTAT OPERATION  
Thermostat Buttons and Battery Holder  
Minimum-Off Timer Compressor  
Protection  
See Fig. 21 for description of thermostat buttons and  
battery holder.  
The TH5110 has an adjustable Minimum-Off Timer that  
can be set from zero to five minutes (Factory Setting—  
five minutes). The Minimum-Off Timer can be bypassed  
through the Installer System Test or it can be bypassed  
permanently by setting the Minimum-Off Timer to 0  
minutes in the Installer Setup.  
D
IGIT  
A
L
D
ISPL  
A
Y
BATTERY HOLDER LAT CH  
PRESS TO RELEASE  
BATTERY HOLDER  
P R E S S  
BATTERY  
OL  
H
DER  
TWO AAA  
ALKALINE  
The Minimum-Off Timer is activated after the compressor  
turns off.  
Inside  
BATTERIES  
Set Ct iool  
ng  
TE  
SETTI  
RAISES  
M
PERA  
T
BUTTO  
UR  
E
Fan  
N
G
N
N
If the thermostat is system powered (common wire), the  
Minimum-Off Timer is also activated upon initial startup  
and after power interruptions.  
Auto Syst eCmo olOn  
TEMPERATURE  
SETTING  
Cool  
TE  
SETTI  
LOWERS  
M
PERA  
T
BUTTO  
UR  
E
N
G
If there is a call for cooling or heating during the  
F
AN BUTTON  
SELECTS AUTO OR ON  
TEMPERATURE  
SETTING  
Minimum-Off Time, the thermostat flashes “Cool On” or  
a
SYSTE  
M
BUTTO  
N
“Heat On” . When the Minimum Off Timer expires, “Cool  
SELECTS HEAT, OFF, COOL OR AUTO  
M22084  
a
On” or “Heat On” appears solid in the display and the  
compressor and fan turn on.  
Fig. 21. Review thermostat button description.  
______________  
Display  
aHeat Pumps only.  
See Fig. 22 for description of display.  
Accessories/Replacement Parts  
INSIDE  
INDICATES BATTERIES ARE  
LOW AND MUST BE REPLACED  
1. Cover Plates (see Fig. 23):  
TEMPERATURE  
5
4
5
0001137-001 (Small) Cover Plate—  
-5/16 in. (109 mm) high x  
Inside Replace Battery HeatCool  
Setting  
-1/2 in. (140 mm) wide.  
TEMPERATURE  
SETTING  
50002883-001(Large) Cover Plate—  
6
8
in. (152 mm) high x  
-5/16 in. (211 mm) wide.  
HeatOn  
CoolOn  
INDICATES  
THERMOSTAT IS  
"CALLING" FOR  
HEAT OR COOL  
Fan  
On Auto  
System  
Heat Cool  
AutoOff  
CURRENT  
FAN SETTING  
CURRENT  
SYSTEM SETTING  
M22083  
Fig. 22. Review display description.  
M22185  
Fig. 23. Cover plate.  
Replacement Battery Holder (see Fig. 24):  
System and Fan Settings  
2.  
5
0000951-001 Battery Holder.  
System  
HeatThermostat controls the heating system.  
OffBoth heating and cooling systems are off.  
CoolThermostat controls the cooling system.  
BATTERY HOLDER  
BATTERY HOLDER  
LATCH  
AutoThermostat automatically changes between  
heating and cooling operation, depending on indoor  
temperature.  
Inside Replace Battery  
Service Needed  
Fan  
System  
Auto  
Cool  
Fan  
Auto Fan runs only when the heating or cooling  
system is on.  
OnFan runs continuously.  
M22111  
Fig. 24. Battery holder.  
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TH5110D NON-PROGRAMMABLE THERMOSTAT  
TROUBLESHOOTING  
Table 5. Troubleshooting  
Possible Cause  
Symptom  
Action  
Display is blank.  
Thermostat is not powered.  
Check for 24 Vac between Rc and C.  
Check that fresh AAA alkaline batteries are  
installed as marked on the battery holder.  
Temperature settings do  
not change.  
The highest or lowest temperature  
setting was reached.  
Temperature setting range:  
H e a t i n g : 4 0 ° F t o 9 0 ° F ( 4 . 5 ° C t o 3 2 ° C )  
Cooling: 50° F to 99°F (10°C to 37°C)  
Heat does not turn on  
Heating equipment failure.  
Check for 24 Vac at the equipment on the  
secondary side of the transformer between  
power and common. If voltage is not  
present, check the heating equipment to  
find the cause of the problem.  
(
Heat On is solid in the  
display).  
Check for 24 Vac between the heat terminal  
(
W) and transformer common. If 24 Vac is  
present, the thermostat is functional. Check  
the heating equipment to find the cause of  
the problem.  
Loose or broken wire connection  
between thermostat and heating  
equipment.  
Check for 24 Vac between the heat terminal  
(W) and transformer common. If voltage is  
not present, check wire connection (loose or  
broken) between the thermostat and the  
heating equipment.  
Cooling does not turn on  
Cooling equipment failure.  
Check for 24 Vac at the equipment on the  
secondary side of the transformer between  
power and common. If voltage is not  
present, check the cooling equipment to find  
the cause of the problem.  
(
Cool On is solid in the  
display).  
Check for 24 Vac between the cool terminal  
(
Y) and transformer common. If 24 Vac is  
present, the thermostat is functional. Check  
the cooling equipment to find the cause of  
the problem.  
Loose or broken wire connection  
between thermostat and cooling  
equipment.  
Check for 24 Vac between the cool terminal  
(Y) and transformer common. If voltage is  
not present, check the wire connection  
(
loose or broken) between the thermostat  
and the cooling equipment.  
Fan does not turn on in a  
call for heat (electric  
furnace).  
Fan Control in Heating (Installer Setup  
Number 3) is set to Gas or Oil Furnace  
(Setting 0).  
Set Fan Control in Heating (Installer Setup  
Number 3) to Electric Furnace (Setting 1).  
Heat pump puts out cool  
air in the heat mode and  
warm air in the cool  
mode.  
Changeover Valve (Installer Setup  
Number 2) is not configured to match the  
changeover required by the installed  
heat pump.  
Set Changeover Valve (Installer Setup  
Number 2) to match the changeover  
required by the installed heat pump.  
Both the heating and  
cooling equipment are  
running at the same  
time.  
The heating equipment is not a heat  
pump but the System Type (Installer  
Setup Number 1) is set to Heat Pump  
(Setting 1).  
Set System Type (Installer Setup Number 1)  
to match the installed heating and/or cooling  
equipment.  
Heating and cooling wires are shorted  
together.  
Separate the shorted heating and cooling  
wires.  
11  
69-1712—1  
href="
TH5110D NON-PROGRAMMABLE THERMOSTAT  
Table 5. Troubleshooting  
Symptom  
Possible Cause  
Action  
Heating equipment is  
running in the cool  
mode.  
Heating equipment is not a heat pump  
but System Type (Installer Setup  
Number 1) is set to Heat Pump  
Set System Type (Installer Setup Number 1)  
to match the installed heating and/or cooling  
equipment.  
(Setting 1).  
Heating equipment does  
not turn off and the heat  
temperature setting is  
set below the room  
Heating equipment is not a heat pump  
but System Type (Installer Setup  
Number 1) is set to Heat Pump  
(Setting 1).  
Set System Type (Installer Setup Number 1)  
to match the installed heating and/or cooling  
equipment.  
temperature (Heat On is  
not in the display).  
Cannot set the system  
setting to Heat.  
System Type (Installer Setup Number 1)  
is set to Cool Only (Setting 4).  
Set System Type (Installer Setup Number 1)  
to match the installed heating and/or cooling  
equipment.  
System Setting Adjustment (Installer  
Setup Number 12) is set to Auto  
Changeover Only (Setting 2).  
Set System Setting Adjustment (Installer  
Setup Number 12) to Manual Changeover  
(Setting 0) or Auto Changeover (Setting 1).  
Cannot set the system  
setting to Cool.  
System Type (Installer Setup Number 1)  
is set to Heat Only (Setting 2) or Heat  
Only with Fan (Setting 3).  
Set System Type (Installer Setup Number 1)  
to match the installed heating and/or cooling  
equipment.  
System Setting Adjustment (Installer  
Setup Number 12) is set to Auto  
Changeover Only (Setting 2).  
Set System Setting Adjustment (Installer  
Setup Number 12) to Manual Changeover  
(Setting 0) or Auto Changeover (Setting 1).  
Heat On is not in the  
display.  
System setting is not set to Heat and/or  
the temperature setting is not set above  
the room temperature.  
Set the system setting to Heat and set the  
temperature setting above the room  
temperature.  
Cool On is not in the  
display.  
System setting is not set to Cool and/or  
the temperature setting is not set below  
the room temperature.  
Set the system setting to Cool and set the  
temperature setting below the room  
temperature.  
Heat On is flashing in the  
display (Heat pumps  
only).  
Compressor minimum off timer is active. Wait up to five minutes for the heating  
equipment to turn on.  
Cool On is flashing in the  
display.  
Compressor minimum off timer is active. Wait up to five minutes for the cooling  
equipment to turn on.  
Temperature Setting Range:  
SPECIFICATIONS  
Heating: 40°F to 90°F (4.5°C to 32°C).  
Cooling: 50°F to 99°F (10°C to 37°C).  
Electrical Ratings:  
Operating Ambient Temperature: 37°F to 102°F  
Voltage  
(50/60 Hz)  
20 - 30 Vac  
(2.8°C to 38.9°C).  
Terminal  
W Heating  
W Heating  
Running Current  
.02 - 1.0A  
100 mA dc  
Shipping Temperature: -30°F to 150°F  
750 mV dc  
(-34.4°C to 65.6°C).  
(
Powerpile)  
Operating Relative Humidity (Non-condensing):  
Y Cooling  
G Fan  
20 - 30 Vac  
20 - 30 Vac  
.02 - 1.0A  
.02 - .60A  
5% to 90%.  
Thermostat Dimensions: 3-7/16 in (86 mm) high x  
-1/2 in. (114 mm) wide x 1-5/16 in. (33 mm) deep.  
4
Automation and Control Solutions  
Honeywell International Inc.  
985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
1
69-1712—1 J.S. Rev. 6-04  
www.honeywell.com/yourhome  

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